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Method for anhydrous tanning of leather

A tanning and leather technology, which is applied in the field of anhydrous tanning leather based on ionic liquid/organic solvent system, can solve the problems of high solution viscosity, large internal mass transfer resistance of leather core, and restriction of tanning effect, etc., so as to reduce mass transfer resistance , Enhance the effect of tanning effect

Active Publication Date: 2021-12-28
FUJIAN AGRI & FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such natural macromolecules with large molecular weight and strong intermolecular hydrogen bonding often have the following problems: some natural macromolecular tanning agents have poor solubility in aqueous solution, and some natural macromolecular tanning agents are soluble in water but have a large solution viscosity. It leads to problems such as large mass transfer resistance inside the leather core, resulting in restricted tanning effect and limited product performance

Method used

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  • Method for anhydrous tanning of leather

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preparation example Construction

[0018] In step S1, the concentration of the tanning agent in the ionic liquid / organic solvent compound solution is 3%-6%. The tanning agent is a modified natural macromolecule tanning agent. Specifically, the preparation method of the tanning agent comprises the following steps:

[0019] In step 1, a natural macromolecular raw material is provided, the raw material is stirred, and sodium periodate is added to the raw material to perform a light-proof reaction.

[0020] The natural macromolecular raw materials can be microcrystalline cellulose, sodium alginate, guar gum, chitosan and carrageenan. After adding sodium periodate, the mass ratio of sodium periodate to natural macromolecular raw material is 1 / 3-2 / 1. The reaction time in the dark is 4-12 hours. During the reaction in the dark, the pH value of the solution was kept at 3-4.5, and the temperature was kept at 30-50°C.

[0021] Step 2, adding ethylene glycol to terminate the reaction, stirring the reaction at room tem...

Embodiment 1

[0031] (1) Weigh chitosan and disperse in water. Add sodium periodate (m (sodium periodate) / m (macromolecular raw material)=1 / 1) under stirring, and react in the dark for 4 hours. During the reaction, the pH value of the solution was maintained at 4.5 and the temperature was 50°C. After the end, ethylene glycol was added to terminate the reaction. Centrifuged, washed with absolute ethanol and deionized water for 5 times successively, freeze-dried, and ground to obtain powdery oxidized chitosan, which was used as a leather tanning agent.

[0032] (2) get an appropriate amount of tanning agent, dissolve in 1-ethyl-3-methylimidazolium bromide / acetone compound solvent (1-ethyl-3-methylimidazolium bromide volume percentage is 30%), make tanning The concentration of the agent is 3%. Take an appropriate amount of skin samples, soak them in acetone for dehydration, and change the liquid 3 times. The tanning agent solution was mixed with the leather sample to make the mass ratio of...

Embodiment 2

[0034] (1) Weigh microcrystalline cellulose and disperse in water. Add sodium periodate (m (sodium periodate) / m (macromolecular raw material)=1 / 3) under stirring, and react in the dark for 12h. During the reaction, the pH value of the solution was kept at 3.5 and the temperature was 40°C. After the end, ethylene glycol was added to terminate the reaction. Centrifuged, washed with absolute ethanol and deionized water for 4 times successively, freeze-dried, and ground to obtain powdery oxidized cellulose, which was used as a leather tanning agent.

[0035](2) Take an appropriate amount of tanning agent, dissolve it in 1-ethyl-3-methylimidazole acetate / dimethyl sulfoxide compound solvent (1-ethyl-3-methylimidazole acetate volume percentage is 70%) ), the tanning agent concentration was 4.5%. Take an appropriate amount of skin samples, soak them in dimethyl sulfoxide for dehydration, and change the liquid once. The tanning agent solution was mixed with the leather sample to ma...

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Abstract

The invention relates to a method for tanning leather without water, comprising: providing a tanning agent, dissolving the tanning agent in an ionic liquid / organic solvent compound liquid to form a tanning agent solution; providing a leather sample, soaking the leather with an organic solvent taking out the skin sample and mixing the skin sample with a tanning agent solution to form a mixture, applying mechanical action to the mixture by using a drum; cleaning the surface of the skin sample, and then immersing the skin sample in clean water; The pH is 9.0‑10.0.

Description

technical field [0001] The invention relates to a method for anhydrous tanning leather, in particular to a method for anhydrous tanning leather based on an ionic liquid / organic solvent system. Background technique [0002] In the traditional tanning process, a large amount of chemical materials such as acids, alkalis, salts, tanning agents, and dyes need to be used, and the use of these materials will cause the content of chromium and ammonia nitrogen in the tanning waste liquid to be at a relatively high level; and, Toxic gases are also emitted during the tanning process. The discharge of waste liquid, waste residue and exhaust gas threatens the health of tanners and the surrounding environment to varying degrees. [0003] With the increasing pressure on the environment, reducing and ultimately solving chromium pollution is an inevitable process in the tanning industry. The development of clean, environmentally friendly and ecological chrome-free tanning agents and their ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C3/08
CPCC14C3/08
Inventor 张敏杨振亚姚元清丁翠翠郭晨晨吴慧黄六莲陈礼辉倪永浩
Owner FUJIAN AGRI & FORESTRY UNIV
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